the flame runs and i can hear the pump, im not sure if the fan is running continouslycould be pcb, bad electrical connection, flow switch, diverter to name but a few.
time for an RGI, will be cheaper than changing your boiler part for part.
also the fan and pump are both running constantly when central heating is turned on
for how long?
flame or no flame?
but the flame comes on, heats the water to the specified temperature set( dosnt affect what this is)
then the flame goes out to just pilot, the pump carries on running
and the central heating stay on till the water goes cold
the pump is running properly
the problem i think is a sensor that is supposed to switch the boiler back on when the water becomes cold
but it dosnt come back on